package util;



import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Formatter;

/**
 * 请求校验工具类
 *
 * @author wl 
 * @date 0704
 */
public class SignUtil {
	
    // 与接口配置信息中的Token要一致
    private static String token = "Javen";

    /**
     * 验证签名
     *
     * @param signature
     * @param timestamp
     * @param nonce
     * @return
     */
    public static boolean checkSignature(String signature, String timestamp, String nonce) {
        String[] arr = new String[] { token, timestamp, nonce };
        // 将token、timestamp、nonce三个参数进行字典序排序
        Arrays.sort(arr);
        StringBuilder content = new StringBuilder();
        for (int i = 0; i < arr.length; i++) {
            content.append(arr[i]);
        }
        MessageDigest md = null;
        String tmpStr = null;

        try {
            md = MessageDigest.getInstance("SHA-1");
            // 将三个参数字符串拼接成一个字符串进行sha1加密
            byte[] digest = md.digest(content.toString().getBytes());
            tmpStr = byteToStr(digest);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        content = null;
        // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
        return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
    }

    /**
     * 将字节数组转换为十六进制字符串
     *
     * @param byteArray
     * @return
     */
    private static String byteToStr(byte[] byteArray) {
        String strDigest = "";
        for (int i = 0; i < byteArray.length; i++) {
            strDigest += byteToHexStr(byteArray[i]);
        }
        return strDigest;
    }

    /**
     * 将字节转换为十六进制字符串
     *
     * @param mByte
     * @return
     */
    private static String byteToHexStr(byte mByte) {
        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] tempArr = new char[2];
        tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
        tempArr[1] = Digit[mByte & 0X0F];

        String s = new String(tempArr);
        return s;
    }
    /**
     * 生成支付签名
     * @return
     */
    /*public static String createMD5SignToPay(Map<String,Object> map){
    	ArrayList<String> list = new ArrayList<String>();
        for(Map.Entry<String,Object> entry:map.entrySet()){
            if(entry.getValue()!=""){
                list.add(entry.getKey() + "=" + entry.getValue() + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" +ConstantUtils.getProperty("WX_APPSECRET");
        System.out.println("Sign Before MD5:" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        System.out.println("Sign Result:" + result);
        return result;
    }*/
    
    /**
     * 生成签名
     * @param jsapi_ticket
     * @param noncestr
     * @param timestamp
     * @param url
     * @return
     */
	public static String createSignature(String jsapi_ticket, String noncestr,String timestamp, String url) {
        String[] arr = new String[] { jsapi_ticket,noncestr, timestamp, url };
        // 将jsapi_ticket,noncestr, timestamp, url几个参数进行字典序排序
        Arrays.sort(arr);
        StringBuilder content = new StringBuilder();
        content.append("jsapi_ticket="+jsapi_ticket);
        content.append("&noncestr="+noncestr);
        content.append("&timestamp="+timestamp);
        content.append("&url="+url);
        
        MessageDigest md = null;
        String signature = null;
        System.out.println("param.................");
        System.out.println(content.toString());
        try {
            md = MessageDigest.getInstance("SHA-1");
            // 将三个参数字符串拼接成一个字符串进行sha1加密
           // byte[] digest = md.digest(content.toString().getBytes());
           // signature = byteToStr(digest);
            md.reset();  
            try {
				md.update(content.toString().getBytes("UTF-8"));
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}  
            signature = byteToHex(md.digest()); 
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return signature;
    }
	private static String byteToHex(final byte[] hash) {  
        Formatter formatter = new Formatter();  
        for (byte b : hash)  
        {  
            formatter.format("%02x", b);  
        }  
        String result = formatter.toString();  
        formatter.close();  
        return result;  
    } 
}
